1991 3.1 v6 thanks for any help, George.

 

It adjusts the timing electronically. Simple explanation would be that it is a replacement for mechanical and vacuum advance.

In the distributor. Remove the cap. It has three connectors on it. Two on the outside (Coil trigger, and connection to computer) and one on the inside (to pickup coil). It is mounted to the base with two screws.

 

Does the ESC directly adjust the timing? Or does it just feed a knock count to the ECM and let the ECM change the timing?

 

The one in the distributor is the ignition module- it reads the mag pickup and also charges and fires the coil when told to do so. The ESC is different and outside the distributor. Don't remember where on a V6 but probably on the firewall or near the rear of the engine. It's tied in with the ECM, the knock sensor and the ignition module. Exactly which one does what and how I'll leave to people smarter than myself with the computer control systems on these cars to explain.

 

It is The (Electronic Spark Control)Moduale, The esc takes its readings directly from the knock sensor and transfers the signle to the ecm and the ecm either retards or advances the timing, to control engine knock! and on our cars they are located at right portion of the firewall just to the right of the brake power booster, it will be mounted on a bracket with a bunch of other relays!
hope this helps!

 

Yeah, I was just thinking about my reply and realized I was thinking about the wrong thing. Came here to correct myself before looking like an idiot. Ohh well! Glad there were some people here to set me straight!!!!

 

Thanks for the input guys I think that that is the problem because all other conditions are ok and when it advances sound directly related to this esc unit there is another thread that I read with a guy with the same car engine and problem he found his connecter laying there disconnected pluged it in and ran fine but will see thats not my luck usualy I've gotta work for it No rest for the insane enough to like cars I guess much less work on them Thanks again , George.